Hampden, North Dakota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 27.8 °F (low) to 48 °F (high). Annual precipitation averages 20.3 Inches. Hampden is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.1 °F | 13.5 °F | 0.5 in. |
| February | -1.3 °F | 18.1 °F | 0.45 in. |
| March | 12.4 °F | 30.5 °F | 0.71 in. |
| April | 27.9 °F | 48.8 °F | 0.96 in. |
| May | 40.9 °F | 63.7 °F | 2.91 in. |
| June | 52.4 °F | 73.0 °F | 3.89 in. |
| July | 56.4 °F | 77.7 °F | 3.42 in. |
| August | 53.9 °F | 77.6 °F | 2.54 in. |
| September | 44.2 °F | 68.1 °F | 1.99 in. |
| October | 31.3 °F | 52.0 °F | 1.49 in. |
| November | 16.6 °F | 33.5 °F | 0.78 in. |
| December | 3.0 °F | 18.9 °F | 0.67 in. |
| Annual | 27.8 °F | 48 °F | 20.31 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |